<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>iframe</title>
	</head>
	<body>
		<body>
					<iframe src="demo3.html" width="100%" height="100px"></iframe>
				<iframe src="demo2.html" width="20%" height="500px" style="float: left;"></iframe>
				<iframe src="demo1.html" width="78%" height="500px"></iframe>
			</body>
	</body>
</html>
